Question

我在MySQL中创建自己的shema，命名项目，我有以下代码和跟随错误，并且不知道如何解决它。如果你帮帮我的话。这是我的第一个这样的项目，我已经尝试了我在stackoverflow上创建的所有内容

服务：

  package service;

    import java.util.List;

    import model.User;

    public interface UserService {
        public User findOne(Long id);
        public List<User> find();
        public User save(User user);
        public void delete(User user);
        public User update(User newUser, Long userId);
        public User findByUsername(String username);

    }

Implementation of service:




 import java.util.List;

    import javax.transaction.Transactional;

    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;

    import model.User;
    import repository.UserRepository;
    import service.UserService;
    @Service
    @Transactional
    public class UserServiceJpa implements UserService {
        @Autowired
        private UserRepository userRepository;

        @Override
        public User findOne(Long id) {
            User user = userRepository.findOne(id);

            return user;
        }

        @Override
        public List<User> find() {
            // TODO Auto-generated method stub
            return userRepository.findAll();
        }
    //...
    }

存储库：

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import model.User;

@Repository
public interface UserRepository extends JpaRepository<User, Long>{
    public User findByUsername(String username);

    public User findOne(Long id);
}

模特课：

import javax.persistence.Entity;
import javax.persistence.Table;

@Entity
@Table(name = "user")
public class User {
    private long id;
    private String username;
    private String password;
    private String name;
    private String surname;
    private UserType type;
    private String dateOfReg;
    private ProfileUser profile;

    public User() {
    }
    //...
    }

的pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>project</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.7</java.version>
    </properties>

    <dependencies>
        <!-- Spring -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cloud-connectors</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.eclipse.persistence</groupId>
            <artifactId>javax.persistence</artifactId>
            <version>2.0.0</version>
        </dependency>

        <!-- Hibernate -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-pool</groupId>
            <artifactId>commons-pool</artifactId>
        </dependency>

        <!-- MySQL -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-releases</id>
            <url>https://repo.spring.io/libs-release</url>
        </repository>

        <repository>
            <id>codehaus</id>
            <url>http://repository.codehaus.org/org/codehaus</url>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-releases</id>
            <url>https://repo.spring.io/libs-release</url>
        </pluginRepository>
    </pluginRepositories>

</project>

的.properties：

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/project?verifyServerCertificate=false&useSSL=true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.useSSL=false

sping.jpa.hibernate.dialect=org.hibernate.dialect.MySQLDialect
spring.jpa.hibernate.show_sql=true
spring.jpa.hibernate.format_sql=true
spring.jpa.hibernate.ddl-auto=update
spring.jpa.hibernate.jdbc.batch_size=50
spring.jpa.hibernate.connection.CharSet=utf8
spring.jpa.hibernate.connection.characterEncoding=utf8
spring.jpa.hibernate.connection.useUnicode=true

错误：

org.springframework.beans.factory.UnsatisfiedDependencyException：使用名称创建bean时出错＆＃39; org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration＆＃39 ;: 通过构造函数参数0表示的不满意的依赖性; 嵌套异常是 org.springframework.beans.factory.BeanCreationException：错误创建名为＆＃39; dataSource＆＃39;的bean在类路径资源中定义 [组织/ springframework的的/ boot /自动配置/ JDBC / DataSourceConfiguration $ Tomcat.class]：通过工厂方法进行Bean实例化失败;嵌套异常是 org.springframework.beans.BeanInstantiationException：失败 instantiate [org.apache.tomcat.jdbc.pool.DataSource]：工厂方法＆＃39;数据源＆＃39;抛出异常;嵌套异常是 java.lang.IllegalStateException：无法加载驱动程序类： com.mysql.cj.jdbc.Driver at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray（ConstructorResolver.java:749）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor（ConstructorResolver.java:189）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor（AbstractAutowireCapableBeanFactory.java:1193）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance（AbstractAutowireCapableBeanFactory.java:1095）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:513）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:483）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:306）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:197）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod（ConstructorResolver.java:372）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod（AbstractAutowireCapableBeanFactory.java:1173）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance（AbstractAutowireCapableBeanFactory.java:1067）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:513）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:483）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:306）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:197）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.getBean（AbstractApplicationContext.java:1078）〜[spring-context-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:857）〜[spring-context-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:543）〜[spring-context-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh（EmbeddedWebApplicationContext.java:122）〜[spring-boot-1.5.4.RELEASE.jar：1.5.4.RELEASE] at org.springframework.boot.SpringApplication.refresh（SpringApplication.java:693） [spring-boot-1.5.4.RELEASE.jar：1.5.4.RELEASE] at org.springframework.boot.SpringApplication.refreshContext（SpringApplication.java:360） [spring-boot-1.5.4.RELEASE.jar：1.5.4.RELEASE] at org.springframework.boot.SpringApplication.run（SpringApplication.java:303） [spring-boot-1.5.4.RELEASE.jar：1.5.4.RELEASE] at org.springframework.boot.SpringApplication.run（SpringApplication.java:1118） [spring-boot-1.5.4.RELEASE.jar：1.5.4.RELEASE] at org.springframework.boot.SpringApplication.run（SpringApplication.java:1107） [spring-boot-1.5.4.RELEASE.jar：1.5.4.RELEASE] at com.example.Sbz3Application.main（Sbz3Application.java:10） [classes /：na]引起： org.springframework.beans.factory.BeanCreationException：错误创建名为＆＃39; dataSource＆＃39;的bean在类路径资源中定义 [组织/ springframework的的/ boot /自动配置/ JDBC / DataSourceConfiguration $ Tomcat.class]：通过工厂方法进行Bean实例化失败;嵌套异常是 org.springframework.beans.BeanInstantiationException：失败 instantiate [org.apache.tomcat.jdbc.pool.DataSource]：工厂方法＆＃39;数据源＆＃39;抛出异常;嵌套异常是 java.lang.IllegalStateException：无法加载驱动程序类： com.mysql.cj.jdbc.Driver at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod（ConstructorResolver.java:599）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod（AbstractAutowireCapableBeanFactory.java:1173）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance（AbstractAutowireCapableBeanFactory.java:1067）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:513）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:483）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory $ 1.getObject（AbstractBeanFactory.java:306）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:202）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate（DependencyDescriptor.java:208）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency（DefaultListableBeanFactory.java:1138）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency（DefaultListableBeanFactory.java:1066）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument（ConstructorResolver.java:835）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray（ConstructorResolver.java:741）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] ... 28个常见帧省略引起： org.springframework.beans.BeanInstantiationException：失败 instantiate [org.apache.tomcat.jdbc.pool.DataSource]：工厂方法＆＃39;数据源＆＃39;抛出异常;嵌套异常是 java.lang.IllegalStateException：无法加载驱动程序类： com.mysql.cj.jdbc.Driver at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate（SimpleInstantiationStrategy.java:189）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod（ConstructorResolver.java:588）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] ... 41个常见帧省略：java.lang.IllegalStateException：无法加载驱动程序 class：com.mysql.cj.jdbc.Driver at org.springframework.util.Assert.state（Assert.java:70）〜[spring-core-4.3.9.RELEASE.jar：4.3.9.RELEASE] at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName（DataSourceProperties.java:231）〜[spring-boot-autoconfigure-1.5.4.RELEASE.jar：1.5.4.RELEASE] at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.initializeDataSourceBuilder（DataSourceProperties.java:183）〜[spring-boot-autoconfigure-1.5.4.RELEASE.jar：1.5.4.RELEASE] at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource（DataSourceConfiguration.java:42）〜[spring-boot-autoconfigure-1.5.4.RELEASE.jar：1.5.4.RELEASE] at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration $ Tomcat.dataSource（DataSourceConfiguration.java:56）〜[spring-boot-autoconfigure-1.5.4.RELEASE.jar：1.5.4.RELEASE] at sun.reflect.NativeMethodAccessorImpl.invoke0（原生方法）〜[na：1.8.0_25] at sun.reflect.NativeMethodAccessorImpl.invoke（未知来源）〜[na：1.8.0_25] at sun.reflect.DelegatingMethodAccessorImpl.invoke（未知来源）〜[na：1.8.0_25] at java.lang.reflect.Method.invoke（Unknown Source）〜[na：1.8.0_25] at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate（SimpleInstantiationStrategy.java:162）〜[spring-beans-4.3.9.RELEASE.jar：4.3.9.RELEASE] ... 42个常见帧省略

Answer 1

您的项目正在使用Mysql5.1，并且您尝试加载的Driver类不存在（com.mysql.cj.jdbc.Driver）。看看这是否有帮助 - 从

更改application.properties行

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

到

spring.datasource.driver-class-name=com.mysql.jdbc.Driver

错误：mySQL

1 个答案: